Metallurgy: Materials and Science Engineering Laboratory; Nas-Nrc Assessment Panel, January 31-February 1, 1991; Technical Activities 1990 (Classic Reprint) - Softcover

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Excerpt from Metallurgy: Materials and Science Engineering Laboratory; Nas-Nrc Assessment Panel, January 31-February 1, 1991; Technical Activities 1990

Other process-control sensors are being studied in the Advanced Sensing Group. Work is continuing on the use of the eddy current sensor, mentioned in connection with the hip program, to measure the temperature of aluminum during manufacturing processes in a joint project with the Aluminum Association. The method has been used successfully for a variety of extruded products (cylindrical, square and I-beam sections) and for plate and sheet, and investigations are now in progress to determine the influence of variations in alloy composition on the accuracy on the technique. The eddy current method is also being used in a new Study of carbon-carbon composites. Work has also continued on ultrasonic sensors being developed with the American Iron and Steel Institute. Earlier laboratory tests demonstrated the feasibility of a method for measuring the internal temperature of solid steel, and ongoing studies are aimed at using the approach to determine the position of the liquid-solid interface in partially solidified metal, information which would be valuable to the measurement of shell thickness during continuous casting. Work to date has indicated that transmission of sound from the solid is not feasible because of scattering from grain boundaries, and it is clear that sound waves must be reflected from the interface from the liquid. Sensors which can be immersed inathe molten metal are therefore being developed.

The High Temperature Materials Chemistry Group is continuing its development of thermochemical computer models for liquid iron and steel processing. Such models are particularly timely in view of recent renewed interest by industry in developing radically new direct reduction steelmaking processes. The modeling research is supported by solution thermochemical data obtained using an unique high pressure, high temperature mass spectrometer facility which allows measurements to be made at temperatures, pressures and compositions representative of steel processing conditions.

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